[#BIO_get_rpoll_descriptor]
= BIO_get_rpoll_descriptor
:mrdocs:

Fill `desc` with the pollable read‐side target for a BIO (if any).

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_get_rpoll_descriptor(
    xref:BIO.adoc[BIO]* b,
    xref:BIO_POLL_DESCRIPTOR.adoc[BIO_POLL_DESCRIPTOR]* desc);
----

== Return Value

1 if a descriptor was returned, or 0 if none / unsupported.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| BIO to query.
| *desc*
| Receives type/discriminator and fd/ssl/custom value for polling.
|===


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